/Engine/Source/Runtime/SlateCore/Public/Input/Reply.h
An event should returnFReply::Handled().SetNavigation( NavigationType ) as a means of asking the system to attempt a navigation
[FReply](API\Runtime\SlateCore\Input\FReply) & SetNavigation ( EUINavigation InNavigationType, const ENavigationGenesis InNavigationGenesis, const ENavigationSource InNavigationSource )